Scratch-resistant full-matte open top-coat paint special for woodware and preparation method of top-coat paint

Abstract

The invention provides a special scratch-resistant full-matt open top-coat for woodware and a preparation method thereof, and belongs to the technical field of woodware paints.The special scratch-resistant full-matt open top-coat comprises a main agent, a curing agent and a diluent; the main agent comprises the following components in percentage by mass: 15-20% of hydroxyl-terminated polyester resin, 0.5-1% of a dispersing agent, 0.1-0.3% of a polyacrylate defoaming agent, 1-2% of fumed silica, 4-6% of butyl acetate, 4-7% of matt powder, 0.3-0.5% of an organic silicon flatting agent, 0.2-0.4% of a drier, 18-22% of a nitrocotton solution and the balance of ethyl acetate, and the sum of the ethyl acetate and the other components is 100%. According to the technical scheme provided by the invention, the purposes of high scratch resistance, stable storage and good use effect of the full-matte open top-coat paint are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of wood coatings, and particularly relates to a special wood scratch-resistant full-matte open clear topcoat and a preparation method thereof. Background Art

[0002] According to the "Investigation and Analysis Report on the Current Situation and Development Prospect of the Wood Coating Market from 2022 to 2026", China is the largest producer of wood furniture in the world, with an annual output value of wood products reaching 307.4 billion yuan, of which about 1.09 million tons of solvent-based wood coatings are consumed. In recent years, as full-matte open-coated furniture has become increasingly popular, the consumption proportion of full-matte open coatings accounts for 5%-10% of the total coating consumption. Therefore, the demand for full-matte open coatings for wood is also increasing.

[0003] However, low-gloss coatings are also accompanied by the risk of being easily scratched, leaving obvious scratches or damages on the surface of the paint film, which affects the beauty and durability of the furniture. Therefore, for full-matte open coatings, it is necessary to meet the market's high demand for high scratch resistance of high-quality coatings. On the other hand, in the prior art, the open full-matte topcoats using acrylic systems and alkyd systems also have problems such as easy stratification during storage and uneven gloss after use. Summary of the Invention

[0004] In view of this, the present invention provides a special wood scratch-resistant full-matte open clear topcoat and a preparation method thereof, achieving the purpose of high scratch resistance, stable storage and good use effect of the full-matte open clear topcoat.

[0005] To achieve the above purpose, the present invention provides a special wood scratch-resistant full-matte open clear topcoat, which includes a main agent, a curing agent and a thinner; the main agent includes the following components in mass percentage: 15-20% of hydroxyl-terminated polyester resin, 0.5-1% of a dispersant, 0.1-0.3% of a polyacrylate defoaming agent, 1-2% of fumed silica, 4-6% of butyl acetate, 4-7% of a matte powder, 0.3-0.5% of an organosilicon leveling agent, 0.2-0.4% of a drier, 18-22% of a nitrocellulose solution, and the balance is ethyl acetate, and the sum of ethyl acetate and the other components is 100%.

[0006] Optionally, the nitrocellulose solution is a mixture of nitrocellulose and ethyl acetate, and the nitrocellulose accounts for 20% of the mass of the nitrocellulose solution.

[0007] Optionally, the main agent includes the following components in mass percentage: 18% of hydroxyl-terminated polyester resin, 1% of a dispersant, 0.3% of a polyacrylate defoaming agent, 1% of fumed silica, 5% of butyl acetate, 4% of a matte powder, 0.5% of an organosilicon leveling agent, 0.2% of a drier, 20% of a nitrocellulose solution, and the balance is ethyl acetate, and the sum of ethyl acetate and the other components is 100%.

[0008] Optionally, the curing agent includes the following components in percentage by mass: 30-40% HDI trimer and 60-70% butyl acetate.

[0009] Optionally, the curing agent includes the following components in percentage by mass: 35% HDI trimer and 65% butyl acetate.

[0010] Optionally, the diluent includes the following components in percentage by mass: 30-50% xylene, 10-30% propylene glycol methyl ether acetate, and 20-40% butyl acetate.

[0011] Optionally, the diluent includes the following components in percentage by mass: 40% xylene, 30% propylene glycol methyl ether acetate, and 30% butyl acetate.

[0012] Optionally, the weight ratio of the main agent, the curing agent and the diluent is 1:0.5:1-1.5.

[0013] In order to achieve the above-mentioned purpose, the present invention also provides a method for preparing a scratch-resistant full-matt open clear topcoat specially used for woodware. The preparation of the main agent comprises the following steps: taking a terminal hydroxyl polyester resin, a dispersant, a polyacrylate defoamer, and butyl acetate and stirring and mixing them at a low speed, adding fumed silica, matt powder, an organosilicon leveling agent, and a drying agent and stirring them at a high speed, and adding a nitrocellulose solution and ethyl acetate and stirring them at a low speed.

[0014] Optionally, the low-speed stirring is a stirring rate of 300-500 rpm and a stirring time of 10-15 min; the high-speed stirring is a stirring rate of 1500-2000 rpm and a stirring time of 20-30 min.

[0015] The above technical solution of the present invention includes at least the following beneficial effects: The technical solution provided by the present invention uses a terminal hydroxyl polyester resin as the main resin, and the main chain thereof contains a plastic part of a long carbon chain, so that the resin has both flexibility and hardness; at the same time, its non-polar side chain also makes the resin have better hardness and durability, and is matched with an HDI trimer curing agent, so that the paint film of the product obtained in the present application has wear resistance and scratch resistance; the fumed silica matting powder containing 0.6% active hydroxymethyl used in the present application can not only participate in cross-linking during the film-forming process, promote the shrinkage and aggregation of the paint film into a uniform concave and convex surface to produce matting, but also enhance the hardness and scratch resistance of the paint film; at the same time, the introduction of nitrocellulose improves the porosity of the product, so that the product has a better opening effect; the dispersant is combined with the other components to achieve overall storage stability, good use effect, and high scratch resistance. DETAILED DESCRIPTION

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention fall within the scope of protection of the present invention.

[0017] The resin used in the present invention is a hydroxyl-terminated polyester resin, the dispersant is BYK103, the matting agent is Goodsey AT3600, the leveling agent is BYK337, the drier is T-12, and the HDI trimer is Bayer 3390. The models of the above components are only for making the embodiments clearer, and suitable models can be selected for the components without indicating the models.

[0018] Example 1 The present invention provides a scratch-resistant full-matt open clear topcoat for woodware, which includes a main agent, a curing agent, and a thinner. The weight ratio of the main agent, the curing agent, and the thinner is 1:0.5:1.2; The main agent includes the following components in mass percentage: 18% hydroxyl-terminated polyester resin, 1% dispersant, 0.3% polyacrylate defoamer, 1% fumed silica, 5% butyl acetate, 4% matting agent, 0.5% silicone leveling agent, 0.2% drier, 20% nitrocellulose solution, and the balance is ethyl acetate. The sum of ethyl acetate and the other components is 100%; The fumed silica matting powder contains 0.6% active hydroxymethyl; The nitrocellulose solution is a mixture of nitrocellulose and ethyl acetate, and the nitrocellulose accounts for 20% of the mass of the nitrocellulose solution; The curing agent includes the following components in mass percentage: 35% HDI trimer, 65% butyl acetate; The thinner includes the following components in mass percentage: 40% xylene, 30% propylene glycol methyl ether acetate, 30% butyl acetate.

[0019] The present invention provides a preparation method for a scratch-resistant full-matt open clear topcoat for woodware, which includes the following steps: The preparation of the main agent includes the following steps: Take the hydroxyl-terminated polyester resin, the dispersant, the polyacrylate defoamer, and butyl acetate and stir at a stirring rate of 400 rpm for 10 min; Add fumed silica, the matting agent, the silicone leveling agent, and the drier and stir at a high speed of 1800 rpm for 25 min, and then add 20% nitrocellulose solution and ethyl acetate and stir at a low speed of 400 rpm for 15 min.

[0020] The preparation of the curing agent includes stirring the HDI trimer and butyl acetate at a low speed of 500 rpm for 10 min.

[0021] The preparation of the thinner includes stirring xylene, propylene glycol methyl ether acetate, and butyl acetate at a low speed for 12 minutes at a stirring rate of 450 rpm.

[0022] Example 2 The present invention provides a scratch-resistant, fully matte, open-clear topcoat for woodware, which includes a main agent, a curing agent, and a thinner. The weight ratio of the main agent, the curing agent, and the thinner is 1:0.5:1; The main agent includes the following components by mass percentage: 15% of hydroxyl-terminated polyester resin, 0.8% of dispersant, 0.2% of polyacrylate defoamer, 1.5% of fumed silica, 6% of butyl acetate, 5% of matte powder, 0.4% of silicone leveling agent, 0.3% of drier, 22% of nitrocellulose solution, and the balance is ethyl acetate. The sum of ethyl acetate and the other components is 100%; The fumed silica matting powder contains 0.6% of active hydroxymethyl; The nitrocellulose solution is a mixture of nitrocellulose and ethyl acetate, and the nitrocellulose accounts for 20% of the mass of the nitrocellulose solution; The curing agent includes the following components by mass percentage: 40% of HDI trimer and 60% of butyl acetate; The thinner includes the following components by mass percentage: 50% of xylene, 30% of propylene glycol methyl ether acetate, and 20% of butyl acetate.

[0023] The present invention provides a preparation method for a scratch-resistant, fully matte, open-clear topcoat for woodware, which includes the following steps: The preparation of the main agent includes the following steps: Take hydroxyl-terminated polyester resin, dispersant, polyacrylate defoamer, and butyl acetate and stir at a stirring rate of 300 rpm for 15 minutes; Add fumed silica, matte powder, silicone leveling agent, and drier and stir at a high speed of 2000 rpm for 20 minutes, then add 20% of the nitrocellulose solution and ethyl acetate and stir at a low speed of 500 rpm for 10 minutes.

[0024] The preparation of the curing agent includes stirring HDI trimer and butyl acetate at a low speed for 15 minutes at a stirring rate of 400 rpm.

[0025] The preparation of the thinner includes stirring xylene, propylene glycol methyl ether acetate, and butyl acetate at a low speed for 10 minutes at a stirring rate of 550 rpm.

[0026] Example 3 The present invention provides a scratch-resistant, fully matte, open-clear topcoat for woodware, which includes a main agent, a curing agent, and a thinner. The weight ratio of the main agent, the curing agent, and the thinner is 1:0.5:1.5; The main agent comprises components in the following mass percentages: 20% of hydroxyl-terminated polyester resin, 0.5% of dispersant, 0.1% of polyacrylate defoamer, 2% of fumed silica, 4% of butyl acetate, 7% of flatting agent, 0.3% of silicone leveling agent, 0.4% of drier, 18% of nitrocellulose solution, and the balance is ethyl acetate, and the sum of ethyl acetate and the other components is 100%; the fumed silica flatting powder contains 0.6% of active hydroxymethyl; the nitrocellulose solution is a mixture of nitrocellulose and ethyl acetate, and the nitrocellulose accounts for 20% of the mass of the nitrocellulose solution; The curing agent comprises components in the following mass percentages: 30% of HDI trimer and 70% of butyl acetate; The thinner comprises components in the following mass percentages: 30% of xylene, 10% of propylene glycol methyl ether acetate, and 40% of butyl acetate.

[0027] The present invention provides a preparation method of a scratch-resistant full-matte open clear topcoat for woodware, which comprises the following steps: The preparation of the main agent comprises the following steps: taking hydroxyl-terminated polyester resin, dispersant, polyacrylate defoamer, and butyl acetate and stirring at a stirring rate of 500 rpm for 13 min; adding fumed silica, flatting agent, silicone leveling agent, and drier and carrying out high-speed stirring at a stirring rate of 1500 rpm for 30 min, and adding 20% of nitrocellulose solution and ethyl acetate and stirring at a stirring rate of 300 rpm for 15 min.

[0028] The preparation of the curing agent comprises stirring HDI trimer and butyl acetate at a low stirring rate of 450 rpm for 12 min.

[0029] The preparation of the thinner comprises stirring xylene, propylene glycol methyl ether acetate, and butyl acetate at a low stirring rate of 450 rpm for 13 min.

[0030] Comparative Example 1 Compared with Example 1, the difference is only that alkyd resin is used instead of hydroxyl-terminated polyester resin, and TDI is used instead of HDI trimer, and the remaining steps and raw materials are the same as those in Example 1.

[0031] Comparative Example 2 Compared with Example 1, the difference is only that low-hydroxyl acrylic resin is used instead of hydroxyl-terminated polyester resin, and the remaining steps and raw materials are the same as those in Example 1.

[0032] Comparative Example 3 Compared with Example 1, the difference is only that ordinary silica flatting powder is used instead of the silica flatting powder containing 0.6% of active hydroxymethyl.

[0033] Performance tests were carried out on the clear topcoats obtained in Example 1 and Comparative Examples 1 to 3, and Table 1 was obtained.

[0034] Table 1 Performance test table of the clear topcoats obtained in Example 1 and Comparative Examples 1-3

[0035] As can be seen from Table 1, the comprehensive performance of the technical solution provided by the present invention in terms of the weather resistance, scratch resistance and storage stability of the paint film is superior to that of Comparative Examples 1-3. Moreover, by combining Example 1 and Comparative Examples 1-3, it can be seen that the hydroxyl-terminated polyester resin in the technical solution of the present invention combines with the fumed silica matting powder to jointly enhance the scratch resistance performance.

[0036] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A scratch-resistant full-matte open clear topcoat for woodware, characterized in that, It includes a main agent, a curing agent and a diluent; the main agent includes components in the following mass percentages: 15-20% of hydroxyl-terminated polyester resin, 0.5-1% of a dispersant, 0.1-0.3% of a polyacrylate defoaming agent, 1-2% of fumed silica, 4-6% of butyl acetate, 4-7% of flatting powder, 0.3-0.5% of an organosilicon leveling agent, 0.2-0.4% of a drier, 18-22% of a nitrocellulose solution, and the balance is ethyl acetate, and the sum of ethyl acetate and the other components is 100%.

2. The scratch-resistant full-matte open clear topcoat for woodenware according to claim 1, wherein The fumed silica flatting powder contains 0.6% of active hydroxymethyl; the nitrocellulose solution is a mixture of nitrocellulose and ethyl acetate, and the nitrocellulose accounts for 20% of the mass of the nitrocellulose solution.

3. The scratch-resistant full-matte open clear topcoat for woodware according to claim 1, characterized in that, The main agent includes components in the following mass percentages: 18% of hydroxyl-terminated polyester resin, 1% of a dispersant, 0.3% of a polyacrylate defoaming agent, 1% of fumed silica, 5% of butyl acetate, 4% of flatting powder, 0.5% of an organosilicon leveling agent, 0.2% of a drier, 20% of a nitrocellulose solution, and the balance is ethyl acetate, and the sum of ethyl acetate and the other components is 100%.

4. The scratch-resistant full-matte open clear topcoat for wooden ware according to claim 1, characterized in that The curing agent includes components in the following mass percentages: 30-40% of HDI trimer and 60-70% of butyl acetate.

5. The special anti-scratch full-matte open clear topcoat for woodenware according to claim 4, characterized in that, The curing agent includes components in the following mass percentages: 35% of HDI trimer and 65% of butyl acetate.

6. The scratch-resistant full-matte open clear topcoat for woodenware according to claim 1, characterized in that, The diluent includes components in the following mass percentages: 30-50% of xylene, 10-30% of propylene glycol monomethyl ether acetate, and 20-40% of butyl acetate.

7. The dedicated scratch-resistant full-matte open-finish clear topcoat for woodware according to claim 6, characterized in that, The diluent includes components in the following mass percentages: 40% of xylene, 30% of propylene glycol monomethyl ether acetate, and 30% of butyl acetate.

8. The scratch-resistant fully matte open clear topcoat for woodenware according to claim 1, characterized in that, The weight ratio of the main agent, the curing agent and the diluent is 1:0.5:1-1.

5.

9. A preparation method of a special anti-scratch full-matte open clear topcoat for woodware as described in any one of claims 1-8, characterized in that, The preparation of the main agent includes the following steps: taking hydroxyl-terminated polyester resin, a dispersant, a polyacrylate defoaming agent, and butyl acetate and stirring them at a low speed for mixing, adding fumed silica, flatting powder, an organosilicon leveling agent, and a drier and stirring them at a high speed, and adding a nitrocellulose solution and ethyl acetate and stirring them at a low speed.

10. The preparation method of the special anti-scratch full-matte open clear topcoat for woodware according to claim 9, characterized in that, The low-speed stirring is at a stirring rate of 300-500 rpm and a stirring time of 10-15 min; the high-speed stirring is at a stirring rate of 1500-2000 rpm and a stirring time of 20-30 min.

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